Onimai: I'm Now Your Sister!

お兄ちゃんはおしまい!

Onimai: I'm Now Your Sister! (Japanese: お兄ちゃんはおしまい!, Hepburn: Onii-chan wa Oshimai!, lit. 'Older Brother Is Done For!') is a Japanese manga series written and illustrated by Nekotofu. The series has been serialized online since 2017; it is also currently serialized in Ichijinsha's Monthly Comic Rex magazine since April 2019. It is licensed in English by Kodansha USA. An anime television series adaptation by Studio Bind aired from January to March 2023; it gained high ratings, although it received a mixed reception from critics.